General • Re: Anyone use PIO for a sensorless BLDC controller?

Code:

Components Needed:    Raspberry Pi Pico    Nidec E98162 motor    NPN Transistor (e.g., 2N2222)    Diode (e.g., 1N4007)    Resistor (1k ohm)    5V Power Supply    Breadboard and jumper wiresCircuit Diagram:    Connect Power to Motor:        VCC pin of the motor to the positive terminal of the 5V power supply.        GND pin of the motor to the collector of the NPN transistor.    Connect Transistor to Pico:        Emitter of the NPN transistor to the ground rail of the breadboard.        Base of the NPN transistor to one end of the 1k ohm resistor.        Other end of the 1k ohm resistor to GPIO 15 on the Pico.    Diode Protection:        Diode across the motor terminals (cathode to VCC, anode to the transistor collector).    Power the Pico:        Ground rail of the breadboard to a ground pin on the Pico.        Ground of the 5V power supply to the ground rail of the breadboard.

Code:

from machine import Pin, PWMimport time# Define the GPIO pin connected to the transistor's basemotor_pin = PWM(Pin(15))# Set the PWM frequencymotor_pin.freq(1000)def set_motor_speed(speed):    # Speed should be a value between 0 and 100    duty_cycle = int(speed * 65535 / 100)    motor_pin.duty_u16(duty_cycle)try:    while True:        # Increase speed from 0 to 100        for speed in range(0, 101, 10):            set_motor_speed(speed)            time.sleep(1)                # Decrease speed from 100 to 0        for speed in range(100, -1, -10):            set_motor_speed(speed)            time.sleep(1)except KeyboardInterrupt:    # Stop the motor if the script is interrupted    set_motor_speed(0)

Code:

Steps:    Connect the motor to the power supply and transistor as described.    Upload the MicroPython code to the Pico.    Run the code and observe the motor speed increasing and decreasing.Conclusion:Starting with a 5V power supply is a safe approach for testing the Nidec E98162 motor. If the motor requires more power, you can safely increase the voltage up to 9V or 12V, but monitor the motor's behavior to ensure it operates within safe limits.